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Mallory bodies compared with microfilament hyperplasia.

J S Sim, K E Franks, S W French

    Archives of Pathology & Laboratory Medicine
    |August 1, 1977
    PubMed
    Summary
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    Mallory bodies (MBs) in mice and humans do not contain actin microfilaments. These liver inclusions share chemical similarities, binding to peroxidase-antiperoxidase, unlike phalloidin-induced microfilaments.

    Area of Science:

    • Hepatology
    • Biochemistry
    • Immunohistochemistry

    Background:

    • Mallory bodies (MBs) are intracellular inclusions found in liver disease.
    • Their precise composition, particularly regarding actin microfilaments, remains debated.
    • Understanding MB composition is crucial for diagnosing and understanding liver pathologies.

    Purpose of the Study:

    • To compare the binding characteristics of mouse and human Mallory bodies (MBs) with phalloidin-induced microfilaments.
    • To determine if MBs are composed of actin microfilaments.
    • To assess the chemical similarity between MBs from different species.

    Main Methods:

    • Indirect immunofluorescence technique was employed.
    • Binding of smooth muscle antibody to microfilaments and MBs was assessed.

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  • Binding of peroxidase-antiperoxidase to microfilaments and MBs was evaluated.

    • Main Results:

    • Smooth muscle antibody bound to phalloidin-induced microfilaments but not to human or mouse MBs.
    • Peroxidase-antiperoxidase bound to both human and mouse MBs but not to microfilaments.
    • These differential binding patterns indicate MBs are not composed of actin.

    Conclusions:

    • Mallory bodies are not composed of actin microfilaments.
    • Mouse and human MBs exhibit similar chemical properties.
    • The findings clarify the composition of MBs and their distinction from actin-based structures.